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Re: 1.03Mpps on e1000 (was: Re: [E1000-devel] Transmission limit)

To: Martin Josefsson <gandalf@xxxxxxxxxxxxxx>
Subject: Re: 1.03Mpps on e1000 (was: Re: [E1000-devel] Transmission limit)
From: Lennert Buytenhek <buytenh@xxxxxxxxxxxxxx>
Date: Sun, 5 Dec 2004 18:58:17 +0100
Cc: Scott Feldman <sfeldma@xxxxxxxxx>, jamal <hadi@xxxxxxxxxx>, Robert Olsson <Robert.Olsson@xxxxxxxxxxx>, P@xxxxxxxxxxxxxx, mellia@xxxxxxxxxxxxxxxxxxxx, e1000-devel@xxxxxxxxxxxxxxxxxxxxx, Jorge Manuel Finochietto <jorge.finochietto@xxxxxxxxx>, Giulio Galante <galante@xxxxxxxxx>, netdev@xxxxxxxxxxx
In-reply-to: <Pine.LNX.4.58.0412051730010.29474@tux.rsn.bth.se>
References: <1101824754.1044.126.camel@jzny.localdomain> <20041201001107.GE4203@xi.wantstofly.org> <1101863399.4663.54.camel@sfeldma-mobl.dsl-verizon.net> <20041201182943.GA14470@xi.wantstofly.org> <20041201213550.GF14470@xi.wantstofly.org> <1101967983.4782.9.camel@localhost.localdomain> <20041205145051.GA647@xi.wantstofly.org> <Pine.LNX.4.58.0412051559350.29474@tux.rsn.bth.se> <Pine.LNX.4.58.0412051638290.29474@tux.rsn.bth.se> <Pine.LNX.4.58.0412051730010.29474@tux.rsn.bth.se>
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On Sun, Dec 05, 2004 at 05:48:34PM +0100, Martin Josefsson wrote:

> I tried using both ports on the 82546GB nic.
> 
>         delay        nodelay
> 1CPU    1.95 Mpps    1.76 Mpps
> 2CPU    1.60 Mpps    1.44 Mpps

I get:

        delay           nodelay
1CPU    1837356         1837330
2CPU    2035060         1947424

So in your case using 2 CPUs degrades performance, in my case it
increases it.  And TDT delaying/coalescing only improves performance
when using 2 CPUs, and even then only slightly (and only for <= 62B
packets.)


--L

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